Artificial tooth-crown



N W. O R B R B,

ARTIFIGIAL' TOOTH GROWN.

- 0; 423,467. Patented Mar. 18, 1890.

N. Perms Phcm-Limomplur. war-mm. no

.UNITED STATE E. PARMLY BRONVN, OF FLUSHING, NEWV YORK.

PATENT OFFICE,

ARTIFICIAL TOOTH-CROWN.

SPEGIFICATION forming partof Letters Patent No. 423,467, dated March 18, 1890. Application filed January 11, 1887. $erial No. 224.016.

(ModeL) Patented in England July 4, 1888, No. 12,310.

To all whom it may concern.-

Be it known that I, E. PARMLY BROWN, a citizen of the United States, and a resident of Flushing, in the county of Queens and State of NewYork, have invented certain new and useful Artificial Crowns for Attachment to the Natural Roots of the Human Teeth, (for which Letters Patent of England were granted July 4, 1888, No.12,310,) of which the follow- IO ing is a specification.

My present invention relates to artificial crowns to be attached to the natural roots of human teeth.

The object of the invention is to produce [-5 an artificial porcelain crown that will combine great strength with natural appearance, and whose construction will admit of easy application and simplicity of manufacture.

The invention consists in colnbiningan artificial porcelain crown with a tapered metal pin having its basal or enlarged end baked in the porcelain crown; also in extending the porcelain body or tooth material of the art-ificial crown onto and around the pin which 2 5 is bakedin the crown, and for ashort distance below the base of the latter, and also in certain details of construction, all as hereinafter set forth.

To enable those skilled in the art to under- 0 stand and make use of my invention, I will proceed to describe the same in connection with the accompanying drawings, which drawings form a part of this specification, and

in which like features are indicated by like 3 5 letters of reference in the several views.

In the drawings, Figure 1 illustrates a side elevation of a porcelain single-pin crown designed for front teeth havingbut oneroot. Fig. 2 is a front elevation of the same crown,

and Fig. 3 is a side elevation of a double-pin crown for teeth having two roots.

I am aware that metal pins have been here tofore baked in artificial teeth; but such pins were unlike mine in form and did not possess 5 the same strength as mine nor the same simplicity of application.

Referring to the drawings, the letter A indicates the porcelain crown, andB the metal pin or pins, (of platinum orplatino-i-ridium) 5 0 which latter are baked in position in the P0106" lain body or tooth material;

In Figs. 1 and 2 the pin B has a head a, which is flattened in a lateral direction corresponding somewhat to the form of the 'in a direction from the front to the back of the crown, and this flattened surface of the shank is broadest where it enters the porcelain crown or tooth material, and from that point it tapers to itsextremity, as shown.

As indicated am, I show the porcelain body or tooth material extending onto and around the pin below the base of thecrown for about the sixteenth of an inch, thus providing an important element of strength at this point, where the strain is greatest.

In Fig. 3, which shows a crown for teeth having two roots, I employ two metal pins B. These pins may have fiat tapering shanks l), the same as the pins of Figs. 1 and 2, and they may be joined at their tops a as in the form of a staple, or may be entirely separate from each other. These pins are baked in the porcelain crown, and the tooth material is caused to extend onto and around the pinsbelow the base of the crown, for the purpose of in creased strength and security at that point, in the same manner as in the constructions of Figs. 1 and 2.

There are recognized advantages in my tapered pin having its basal or enlarged end baked in the porcelain crown. WVhen'the pin is of uniform diameter, it is required to be made smaller than is desirable for strength, in order that it may be entered into the canal of the tooth-root without unduly enlarging said canal, and when such a pin is subjected to strain when in use it is liable to break at thepoint where it is joined to the porcelain crown; and, on the other hand,.if made of a size large enough to insure the necessary strength, the opening in the tooth-root is necessarily required to be so great as to mate rially weaken the walls of the latter.

By making use of my tapered pin and baking its basal or enlarged end into theporcelain crown I obtain the required strength at IOC the point of union with the porcelain crown and avoid the necessity of unduly enlarging the tooth-root opening;

" Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is, a

1. An artificial crown of porcelain for attachment to the natural root of a human tooth, in combination with a tapered metal pin having its basal or enlarged end baked in the porcelain body, substantially as set forth.

2. An artificial crown of porcelain for attachment to the natural root of a human tooth, having baked therein a metal pin 1 whose shank is broadest at the point where it enters said-crown, and having the porcelain body or tooth material extended around said broadened portion of the shank for a short at right angles to the face of said crown, and

a head integral with the shank and flattened at right angles to the flat surface of the shank, substantially as set forth 5. As a new article of'manufacture, a metal 1 pin for attaching an artificial crown to a natural root of a human tooth, having a fiat shank whose shank is'flattened at right angles to the 1 and a head integral with the shank and fiattoned at right angles to the fiat surface of the shank, substantially as set forth.

Signed at F1ushing,in the county of Queens and State of New York, this 8th day'of December, A. D. 1886.

E. PARMLY BROWN.

Witnesses:

L. PARMLY BROWN, D. F. PHALON. 

